package com.example.heatbeat;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.ThreadLocalRandom;
/**
 * @author xingzhiwen
 * @date 2021/11/16
 * @ddescription:
 */
/**
 * 处理服务端业务逻辑：心跳超时处理、客服端返回的数据处理
 *
 * @author Administrator
 *
 */
public class NettyUDPServerHandler extends SimpleChannelInboundHandler<DatagramPacket> {

    private static final String[] DICTIONARY = {"只要功夫深，铁棒磨成针。", "旧时王谢堂前燕，飞入寻常百姓家。",
            "洛阳亲友如相问，一片冰心在玉壶。", "一寸光阴一寸金，寸金难买寸光阴。", "老骥伏枥，志在千里。烈士暮年，壮心不已！"};

    private String nextQuote() {
        int quoteId = ThreadLocalRandom.current().nextInt(DICTIONARY.length);
        return DICTIONARY[quoteId];
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        // TODO Auto-generated method stub
        ctx.close();
        cause.printStackTrace();
    }

    @Override
    protected void messageReceived(ChannelHandlerContext ctx, DatagramPacket msg) throws Exception {
        // TODO Auto-generated method stub
        String req = msg.content().toString(CharsetUtil.UTF_8);
        System.out.println(req);
        if ("谚语字典查询？".equals(req)) {
            ctx.writeAndFlush(new DatagramPacket(Unpooled.copiedBuffer("谚语查询结果：" + nextQuote(), CharsetUtil.UTF_8), msg.sender()));
        }
    }
}